In Phase USW300 300W Underseat Subwoofer Car – Active Car Subwoofer with Built – Rich Powerful Subwoofer for Car – With a built in amplifier, max output of 300 W and 130 W RMS, the In Phase USW300 is a true pocket powerhouse of audio performance. Coned Aluminium Active Subwoofer Car – Aluminium Cones are light in weight and can be really stiff, but they are really robust cones that rarely go wrong. This sub has a damping material built into its cone and spider to ensure a rattle-free performance and deep bass Heavy duty durable construction – Die Cast Aluminium Chassis – no plastic structure here. The metal body is part of a secure and rigid structure, no flexing body when the unit is in full power, this also helps with bass output. Compact and discrete – Allowing to install the USW300 anywhere within vehicles boot, under seats, behind seats or in the foot well Trusted Brand – In Phase is a UK based brand, our team currently has over 500 years of audio research and development experience, creating quality products from premium material that our customer deserve, including, car audio speakers & subwoofers.